Apparatus for washing iron-blast-furnace gases.



PATENTED AUG. 18, 1908.

. B. H.` THWAIT'E. APPARATUS FOR WASHING IRUN BLASTF FURNAGE GASES.

APPLICATION FILED JUNE 23, 1905.

2 SHEETS-SHEET 1.

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No. 896,175. PATBNTBD AUG. 18, 190s.

` '13. H. THWAITB. A APPARATUS FORy WASHING IRON BLAST PURNAGE GASES.

APPLICATION :FILED .TUNE 23, 1905.

.2 SHEETS-SHEET 2.

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UNITED sTATEs PATENT oEErcE.

BENJAMIN H. THWAITE, OF WESTMINSTER, LONDON, ENGLANI).

APPARATUS FOR WASHING IRON-BLAST-FURNACE GASES.

'To all whom it may concern:

Be it known that I, BENJAMIN H. THWAITE, subject of the King of GreatBritain and Ireland, and residing at Westminster, London, England, haveinvented certain new and useful Improvements in Apparatus for WashingIron-BlastFurnace Gases, of which the following is a specifica* tion.

This invention relatesto apparatus for washing blast furnace gases, andespecially to so called box-washers comprising boxes containing waterand divided by partitions which depend from the top of each box belowthe water level so that the gases which are drawn or forced through thewasher are caused to work their way under each partition and thus comeinto direct contact with the water.

The object of the present invention is to improve this type ofapparatus' so that the gases are more thoroughly washed and cooled andrendered more iit for use in gas engines and also to enable some of theheat removed from the gases passing through the washer to be utilized insoftening water.

According to the present invention each partition is fitted with amovable screen or perforated plate just beneath its lower edge so thatthe gases are compelled to fiow in small streams or jets, the screensbeing adapted to be swung about pivots or hinge pinsby means of levers.

In the preferred form of the apparatus it is constructed as a series ofcompartments' so that the gases are compelled to pass in successionthrough water a number of times and the whole washer is (provided with awater seal or trough to permit cleaning or removal of deposits evenduring operation, and further the top of the apparatus is constructed asa tank so that the water therein not only aids in cooling the gases inthe washer but may be heated to a temperature that will suflice toeffect the separation of the lime from the water which latter may beernployed for circulation in the engine jacket or for other purposes.

In the accompanying drawings, Figure l is a transverse sectionalelevation of a double box-washer according to the invention. Fig. 2being a plan corresponding thereto, Fig. 3 is a transverse sectionalelevation of a single box-washer according to the invention, Fig. 4 is alongitudinal sectional elevation on En@ x-Y, Eig. 2.

Specification of Letters Patent.

Application led .Tune 23, 1905.

Patented Aug. 18, 1908.

serial No. 266,645.

In carrying out the invention the main casing or box, a, is divided bypartitions, t, into a number of compartments or chambers,

c. Each partition, b, dips below or is formed with an opening below, thewater level and adjacent to orin each opening is mounted a wire gauzescreenor perforated plate, d, carried by brackets, e, on a shaft or rod,f, one.

end of which passes through the outer side wall of the main casing, a,and is formed with or as a hand lever, g, so that the screen, d, can beoscillated.

The main box or casing, a, is mounted in a trough or water seal, h, andsome or all of the separate compartments lare provided with sideopenings for instance as indicated at i, to enable matter deposited inthe chambers to be removed without stopping the operation of theapparatus.

The water level in the apparatus is determined bythe position of anoverflow pipe, k,

(Fig. 4) fitted to one of the chambers, the pipe being provided with a.hydraulic seal, Z.

Obviously a single series of chambers may be used in which case thetrough, h, need only be along one side as shown inFig. 3 or a doubleseries may be used as indicated in Figs. 1 and 2 the gases entering thefirst chamber through an inlet ipe, m, and then passing through the chamers in succession as indicated by the arrows in Figs. 1 and 2 issuingfrom the last chamber by an outlet ripe, a

By combining or arranging a number of box-washers as described as manystages of temperature reduction may be arranged as there are washers,for instance in the first the temperature of the gas maybe reduced fromsay, 500 to 250 F. and in the second from 250 t0 150O F.

In order to further reduce the temperature of the gases, and to do so insuch a way that the heat maybe utilized, the top of the main casing, a.,may be made in the form of a shallow tank or closed vessel, 0, in whichhard water'may be heated to a temperature that will be sufficient toeffect the separation of the lime from the water, so that such water maybe used for circulation in the gas engine jacket, or soft water maybetreated for steam generating purposes. The top of .the casing, a,forming the bottom of the tank, o, may be made of suitable form andmaterial to present considerable heat exchanging surface. The tank isfitted'with suitable inlet and outlet pipes, p g.

Iny order to secure more effective water .l jacent to said openingsmeans for agitating I.

scrubbing of the gases, the waterin the .box washersis allowed to becomehighly saturated with ythe deposited solid` matter, so

that its ,density is increased and with it itsf frictional efficiency. YlThe degree of dust separation from the gas isa function of theresistance set up and this resistance is increased as the water becomescharged with the water separated from the gas. In order vto increase thefrictional resistance a certain portion of liquid taf may be added tothe r ters Patent is 'f 1. A box washer comprising a maincasing, waterin said casing, partitions dividing the casing intocompartments,andhaving openings below the water level, hinged screens adjacent tosaid openings and means` for agitating said screens adapted .to beoperated from outside said casing.I l

2. A box washer comprising a main casing,

. water in said casing, partitions dividing the casing intocompartments, and havingopenings below the water level, hinged screensadsaid screens adapted to be'operated from out-k inbefore set forth. v

3. A box washer vcomprising a main casing, water in said casing,partitions dividing the casing into compartments, and having open.

ings below the water level, hinged screensvv adjacent to said openingsmeans for agif tating said'screens adapted to be operated` fromoutsidesaid casing, awater outletfpi-pe v{ittedto one of the compartments andahyf Y* drauiic seal for saidpipe substantially as and for thepurposehereinbefore set forth.

4. A box-washer comprising a main casing `water in said casing,partitions dividingthe casmgmto series Aofcompartments and havyingopenings below the water level, screens In :testimony whereof Ihavehereunto set.

my hand in presence of two subscribing wit.

nesses.`

B. n. Tnwiirrny Witnesses:

CHAs, GILLIARD, WM. GooDALL CHAMBERS.

35V` i side said casing, a water trough alongside the v v rnaink casingand openings` in the side and 'near the bottom of the'casing communi-4 Ay `eating .with said trough for the purpose herey

